GB1512849A - Hybrid circuits for communication systems - Google Patents
Hybrid circuits for communication systemsInfo
- Publication number
- GB1512849A GB1512849A GB33483/75A GB3348375A GB1512849A GB 1512849 A GB1512849 A GB 1512849A GB 33483/75 A GB33483/75 A GB 33483/75A GB 3348375 A GB3348375 A GB 3348375A GB 1512849 A GB1512849 A GB 1512849A
- Authority
- GB
- United Kingdom
- Prior art keywords
- path
- coupled
- amplifying means
- capacitor
- bidirectional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
- H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/586—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa using an electronic circuit
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Interface Circuits In Exchanges (AREA)
- Amplifiers (AREA)
- Networks Using Active Elements (AREA)
Abstract
1512849 Hybrid circuits WESTERN ELECTRIC CO Inc 12 Aug 1975 [16 Aug 1974] 33483/75 Heading H4R A hybrid circuit for coupling an incoming path 35 and an outgoing path 34 to a bidirectional path TLI comprises amplifying means AH having a feedback arrangement for cancelling from signals outgoing from the bidirectional paths, signals received from the incoming path. The amplifying means is coupled to the bidirectional path via a transformer 11, the primary 10 of which is coupled in series with a capacitor across the path TLI, and the secondary 12 of which is coupled in series with a further capacitor 14 which provides a frequency compensating feedback signal to the amplifying means. The arrangement is to reduce hybrid instability at low frequencies caused by the large inductance of the coupling transformer. The capacitor 14 and resistor 15 operate in conjunction with components 31-33 to reduce the gain of the transmit amplifier at low frequencies, the components 31-33 correcting a D.C. imbalance caused by resistor 15. The application is to resonant transfer PAM, TDM telephone systems.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/498,056 US3934099A (en) | 1974-08-16 | 1974-08-16 | Bias, feedback and network arrangements for hybrid circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1512849A true GB1512849A (en) | 1978-06-01 |
Family
ID=23979430
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB33483/75A Expired GB1512849A (en) | 1974-08-16 | 1975-08-12 | Hybrid circuits for communication systems |
Country Status (8)
Country | Link |
---|---|
US (1) | US3934099A (en) |
JP (1) | JPS5832811B2 (en) |
CA (1) | CA1047659A (en) |
DE (1) | DE2535900C2 (en) |
FR (1) | FR2282197A1 (en) |
GB (1) | GB1512849A (en) |
IT (1) | IT1041826B (en) |
SE (1) | SE402038B (en) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2607480C2 (en) * | 1976-02-20 | 1982-11-25 | Deutsche Telephonwerke Und Kabelindustrie Ag, 1000 Berlin | Circuit arrangement for a fork |
US4074087A (en) * | 1976-08-16 | 1978-02-14 | Bell Telephone Laboratories, Incorporated | Bidirectional voice frequency repeater |
AU536210B2 (en) * | 1980-06-18 | 1984-04-19 | Telefonaktiebolaget Lm Ericsson (Publ) | Subscriber line audio processing circuit apparatus |
US4488294A (en) * | 1982-03-30 | 1984-12-11 | At&T Bell Laboratories | Establishing and supporting data traffic in private branch exchanges |
CA1239718A (en) * | 1985-10-11 | 1988-07-26 | Trillium Telephone Systems Inc. | Key telephone system |
CA1240088A (en) * | 1985-11-20 | 1988-08-02 | Mitel Corporation | Solid state trunk circuit |
US4758822A (en) * | 1986-04-30 | 1988-07-19 | Gte Communication Systems Corporation | Bidirectional amplifier |
US4716358A (en) * | 1986-11-12 | 1987-12-29 | Northern Telecom Limited | Constant current circuits |
US4982426A (en) * | 1989-01-19 | 1991-01-01 | Northern Telecom Limited | Telecommunications line interface circuits |
US5282157A (en) * | 1990-09-13 | 1994-01-25 | Telecom Analysis Systems, Inc. | Input impedance derived from a transfer network |
US5515433A (en) * | 1994-08-30 | 1996-05-07 | Reltec Corporation | Resistance forward telephone line feed circuit |
US6298046B1 (en) * | 1998-08-28 | 2001-10-02 | Rc Networks | Adjustable balancing circuit for an adaptive hybrid and method of adjusting the same |
US6751202B1 (en) | 1999-04-30 | 2004-06-15 | 3Com Corporation | Filtered transmit cancellation in a full-duplex modem data access arrangement (DAA) |
US7050574B1 (en) * | 1999-09-30 | 2006-05-23 | Stmicroelectronics, Inc. | Telephone line interface circuit and method |
US6603352B2 (en) | 2001-12-03 | 2003-08-05 | Icefyre Semiconductor Corporation | Switched-mode power amplifier integrally performing power combining |
US7342300B2 (en) * | 2003-06-30 | 2008-03-11 | Zarbana Digital Fund Llc | Integrated circuit incorporating wire bond inductance |
US8213489B2 (en) * | 2005-06-23 | 2012-07-03 | Agere Systems Inc. | Serial protocol for agile sample rate switching |
US7773733B2 (en) * | 2005-06-23 | 2010-08-10 | Agere Systems Inc. | Single-transformer digital isolation barrier |
US7940921B2 (en) | 2005-06-23 | 2011-05-10 | Agere Systems Inc. | Continuous power transfer scheme for two-wire serial link |
FR2906098B1 (en) * | 2006-09-14 | 2009-04-03 | Rene Duranton | METHOD AND DEVICE FOR TRANSMITTING INFORMATION ON A COMPLEX NETWORK. |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3480742A (en) * | 1967-03-31 | 1969-11-25 | Bell Telephone Labor Inc | Hybrid circuit |
US3586881A (en) * | 1967-12-29 | 1971-06-22 | Bell Telephone Labor Inc | Transistor hybrid circuit |
US3789154A (en) * | 1972-12-11 | 1974-01-29 | Bell Telephone Labor Inc | Switchhook status signaling arrangement |
US3828146A (en) * | 1973-03-22 | 1974-08-06 | Bell Telephone Labor Inc | Time division conference hybrid circuit |
US3855431A (en) * | 1973-04-02 | 1974-12-17 | Itt | Electronic hybrid amplifier |
-
1974
- 1974-08-16 US US05/498,056 patent/US3934099A/en not_active Expired - Lifetime
-
1975
- 1975-06-30 CA CA230,526A patent/CA1047659A/en not_active Expired
- 1975-08-05 SE SE7508836A patent/SE402038B/en not_active IP Right Cessation
- 1975-08-12 DE DE2535900A patent/DE2535900C2/en not_active Expired
- 1975-08-12 GB GB33483/75A patent/GB1512849A/en not_active Expired
- 1975-08-12 IT IT26315/75A patent/IT1041826B/en active
- 1975-08-14 FR FR7525447A patent/FR2282197A1/en active Granted
- 1975-08-16 JP JP50099087A patent/JPS5832811B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
SE7508836L (en) | 1976-02-17 |
FR2282197B1 (en) | 1979-06-15 |
FR2282197A1 (en) | 1976-03-12 |
JPS5144851A (en) | 1976-04-16 |
DE2535900A1 (en) | 1976-02-26 |
SE402038B (en) | 1978-06-12 |
US3934099A (en) | 1976-01-20 |
CA1047659A (en) | 1979-01-30 |
IT1041826B (en) | 1980-01-10 |
DE2535900C2 (en) | 1985-08-22 |
JPS5832811B2 (en) | 1983-07-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |